Ive tied 6 to one cinderblock in 4-5' of water, every 50' or so around a pond, made loops of paracord that were 4' long, tied one end to the base of the Christmas Tree and looped the other end over a 2" dia pipe that was driven into the bottom of the pond in the deepest part to make an underwater Christmas tree from the pond bottom to the surface. I don't think Christmas trees have enough flotation to turn a cinderblock upright to stand up.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).